Perfect solution is a supply that is 100% efficient and gives 1.1V @ 1200mA
(power for 6 NIMO tubes), and magically limits the current to 200mA.
Nothing will ever be this good; it's just a reference point for
cost-comparison.
The FPGA solution I described is an added feature for the 2.5V
@gregebert What is "perfect solution" with respect to the 1.1V supply? Is
that your fancy FPGA soft-start setup ???
Jon J.
On Tue, Oct 23, 2018 at 11:30 AM gregebert wrote:
> If you want absolute minimum energy consumption, then you will want to
> ramp the power supply, etc. I looked at a
If you want absolute minimum energy consumption, then you will want to ramp
the power supply, etc. I looked at a lot of tradeoffs and calculated the
cost of energy for each.
Circuit/component costs were not modeled.
I have the option of soft-starting my 2.5V filament transformer, because
it's
Hey folks,
Have you seen these VFD tubes on Ebay? http://www.ebay.com/itm/223200328320
It looks like a quite rare find, I have never seen those before.
Best wishes
Jens
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A simple solution then would be to use one resistor, or two resistors one
in each branch, of the heater chain to maintain a centered reference
compared to ground even during startup, and a relay shorting that/those
resistors after some time - just like slow starters for toroidal
transformers
H... a transformer short circuit current, which is the maximum current
that it can supply, is not the design or specified one, which in this case
would be 1.2A and which is the current it can supply indefinitely while
maintaining all of the design parameters.
The ideal transformer has, of
You don't need to put all of the tubes if you use limiting resistors (or
some other protection device) in series with the filaments. Just the one
you calculated for normal use will do.
This case (very expensive, unobtanium tubes that will be gone forever if
zapped) fully justifies a slow turn
On Tuesday, October 23, 2018 at 4:59:29 AM UTC-7, Dekatron42 wrote:
>
> @gregebert: Isn’t there a risk of flash-over if you don’t use high voltage
> resistors for the anode connection?
These are series resistors which normally have only a minimal voltage-drop
across them, typically 3V. No
@jrehwin: If I order a transformer with 1.1V center tapped transformer with
1.2A rating for driving six NIMOs, do I have to load it with 5 ”NIMOs” if I
want to test just one NIMO?
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@gregebert: Isn’t there a risk of flash-over if you don’t use high voltage
resistors for the anode connection?
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